Rotary abrading brush



May 18,1926. w 1,584,997 L. B. SHULTZ ROTARY ABRADING BRUSH Filed June 19, 1924 INVENTOR L. B. SHULTZ ATTORNEY f atented l'tfay ltd, 392$.

LLEWELLYN B. SHULTZ, OF ST. LOUIS, MISSOURI, ASSIGNOR TO PILLEY PACKING- &

FLUE BRUSH MANUFACTURING COMPANY, OF ST. LOUIS, MISSOUBI,-A CORPORA- TION OF MISSOURI ROTARY ABRADING BRUSH.

Application filed June 19, 1924. Serial No. 720,911.

My invention relates to a rotary abrading brush suitable for removing carbon from cylinders of internal combustion engines, for removing paint and rust from iron structures, and for other similar purposes.

The present invention relates to certain improvements in the form of brush shown and described in my prior Patent No. 1,538,- 220, dated May 19, 1925.

In the accompanying drawings which illustrate one form of brush made in accord ance with my invention, Figure 1 is a side elevation; Figure 2 is a longitudinal central section; and Figure 3 is an end view.

The supporting member or core of the brush, indicated at 5, is preferably made larger at the lower end than at the top, said large lower end being externally threaded to receive corresponding internal threads on a compression sleeve 6. Rotation of the sleeve relative to the core will move the sleeve longitudinally and thus vary the amount of compression and consequent stiffness of the conical abrading tuft 7 I have found that the friction of the abrading tuft against the sleeve cannot be depended upon to hold the latter in adjusted position and I therefore provide the core with a lock nut 8 adapted to be turned firmly against the end of the sleeve 6 after the latter is adjusted and to thus positively lock it against accidental movement relative to the core. Extending centrally through the core 5 is a longitudinal passage 9 having internal threads to receive the stem of the abrad-v ing tuft. Passage 9 is preferably enlarged as indicated at 10 to receive the upper end of the abrading tuft.

The abrading tuft 7 is composed of tempered steel wire and is held between the strands of .a .stem 11 formed by twisting to gether iron rods, preferably four in number. Both ends of the stem 11 are threaded, the upper end being screwed into the lower end of the passage 9 and the lower end engaged by a nut 12 which holds the strands of the stem firmly together and prevents their spreading and the consequent loosening of the wires of the abrading tuft 7. The

wires ofthe tuft 7 are graduated in length so that the working face 18 of the brush is normally concave, as shown in Figure 2. Threaded into the upper end of the flange 9 is a shank 14; by means of which the brush is secured in the chuck of the actuating mechanism such as a drill press or a flexible driving shaft.

In operation the concave face 13 of the rapidily rotating brush is forced against the surface to be cleaned. Owing to the form of the face the outer wires of the tuft will first come in contact with the surface and as pressure is exerted the outer wires will bend allowing those nearer the center of the brush to contact with the surface to be cleaned. By this construction a more even pressure throughout the working face of the brush is obtained than would be pos sible if the said face were fiat. By adjusting the sleeve 6 longitudinally the angle of the brush and the consequent concavity of the face may be changed to adapt the brush to the class of work to be done. The use of the lock nut 8 permits of the sleeve being effectively secured in position after the adjustment has been made and the nut 12 prevents spreading of the strands of the stem 11. The end of the stem 11 also acts as a stop to limit the movement of the brush toward the work and thus prevent injury to the wires by over compression.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a device of the class described, the combination with a supporting member externally threaded, of a conical abrading tuft secured by said member, an internally threaded compression sleeve on said member and engaging said tuft, and a lock nut on said member for securing said sleeve in adjusted position.

2. In a device of the class described, the combination with an internally threaded supporting member, of a compression sleeve movable longitudinally with respect to said member, and a conical abrading tuft secure-d between the strands of a stem composed of a plurality of rods twisted together, said stem being threaded at both ends, one of said threaded ends being engaged by the supporting member and the other by .a nut to prevent spreading of the strands.

3. In a device of the class described, the combination with a supporting member externally and internally threaded, of an internally threaded compression sleeve onsaid ends engaging with the internal threads of member, a locking nut on said member for said supporting member andthe other with securing said sleeve in adjusted position, and a nut to prevent spreading of the strands. a-eonicalabradingtuft secured betweenthe In testimony whereof, I have hereunto strands of a stem-composed of a plurality set my hand this the 17th day of June, of rods twisted together, said stem being 1924.

threaded at both ends, one of said threaded L. B. SHULTZ. 

